Rock-drilling machine



(No Model.)

W. H. CLARK.

ROCK DRILLING MACHINE.

Patented Nov. 17, 1885.

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NITED STATES PATENT Orrice.

WILLIAM H. CLARK, OF WHAT CHEER, IOWA.

ROCK-DRILLING MACHINE.

SPECIFICATION forming part of Letters Patent No. 330,376, dated November 17, 1885,

Application filed April 16, 1985. Serial No. 162,459. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM H. CLARK, of What Cheer, in the county of Keokuk and State of Iowa, have invented a new and Improved Drilling-lvlachine, of which the following is a full, clear, and exact description.

The object of my invention is to provide a new and improved machine for drilling coal, rock, &c.

The invention consists in the combination, with a tube for holding the drilling-bit, of bevel-gearing for revolving the tube and a fixed screw held in a frame and passed through a nut on the end of the said tube, whereby the bit is moved forward automatically.

Reference is to be had to the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.v

Figure l is a longitudinal sectional elevation of my improved drilling-machine. Fig. 2 is a side view of the same. Fig. 3 is a cross sectional view on the line 00 a, Fig. 1.

The tube A is provided with a longitudinal groove, A, for receiving a spline or key, B, in a bevel cog-wheel, B, through which the tube passes, and which is-mounted to turn in a frame, 0, and engages with a bevel cogwheel, D, pivoted on the frame 0, and having a crank-handle, E.

Two bars, F, are secured to the frame 0, and are united by a cross-piece, G, from which a screw-spindle, H, projects through the frame 0 and into the tube A. V

A nut, J, formed of two sections hinged together, is placed on the end of the tube A, and the screw-spindle H passes through the aperture in the nut, and the threads of the spindle engage with the threads of the nut. The nut J is provided with suitable latches or locking devices,K, for locking the sections together. The end of the bit or anger is placed into the end of the tube A, which is squared so that the bit cannot turn in the tube. From the frame 0 two opposite arms, M, project.

The spindle H is held in a cross-piece, G, by a pin, G, so that it cannot revolve on its longitudinal axis.

The operation is as follows: One or both of the arms M are rested against a post, &c., and the crankhandle E is turned, whereby the tube A and the bit L, held in the same, are turned on their longitudinal axis. At the same time the nut J is turned with the tube, and as it turns on the spindle H, the nut J, tube A, and bit L are moved in the direction of the arrow a, and the bit is thus fed forward automatically as rapidly as it cuts. \Vhen the nut and tube A are to be moved back to the cross-piece G, the nut is opened and disengaged from the spindle H, and the tube A is driven in the inverse direction of the arrow A. The screw at all times remains fixed, and as the greater part of it is covered by the tube A it cannot become clogged with dust, &c. I

The machine can be used to bore horizontally, vertically, or at an angle.

When it is desired to clean the hole, the pin G is withdrawn,so as to permit the screwspindle H to revolve on its longitudinal. axis. When wet and muddy coal is being bored, and the hole is to be cleared, the spindle His loosened so that the bit will not be moved forward, and thereby the mud, bits of coal, 8rd, will be carried out of the hole by the screwbit L; or when hard rock is being bored the bit must not be fed as rapidly as the above-described mechanism provides for, so the pin G is removed and the spindle loosened.

I am aware that a boring-machine has heretofore been constructed with a stationary feedscrew connected to the longitudinally-mov- I ing bar by a system of gears and spring-operated rod in such a manner that the boring bar and its cutter-head may be moved rapidly to a particular point before beginning to operate, and I do not claim such as of my invention.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a drillingmachine, the combination, with a frame, of cog-wheels mounted on the same, a tube passed through one cog-wheel and revolved by the same, rods secured to the frame, a cross piece uniting the rods, a screw-spindle secured to the cross-piece, and

a nut on the end of the tube, through which projecting from the cross piece through the nut the spindle passes, substantially as herenut J and into the tube, substantially as here 10 in shown and described. in shown and described. r

2. In'adrilling-machine, the combination, v 5 with the frame 0, of the bevel cog-Wheels B WILLIAM K D, the tube A, the nut J, formed of two sec- Witnesses: tions and held on the end of the tube, the DANIEL DODGE, rods F, the cross-piece G, and the spindle H, WILLIAM H. ROYLF. 

